Phase-resolved optical photometry and spectroscopy of the supersoft X-ray binary 1E 0035.4-7230

Details Phase-resolved optical photometry and spectroscopy of the supersoft X-ray binary 1E 0035.4-7230 Phase-resolved optical photometry and spectroscopy of the supersoft X-ray binary 1E 0035.4-7230

Oct 1998

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998a%26a...338..947v&link_type=abstract

Astronomy and Astrophysics, v.338, p.947-956 (1998)

Astronomy and Astrophysics

Astrophysics

14

Accretion, Accretion Disks, Stars: Individual: 1E 0035.4-7230, Novae, Cataclysmic Variables, White Dwarfs, X-Rays: Stars

Scientific paper

We present phase-resolved optical photometry and spectroscopy of the supersoft X-ray binary 1E 0035.4-7230 (= SMC 13). The average U, B, V, and R light curves show an almost perfect sinusoidal Delta m ~ 0.3 mag modulation on the 4.1 hr orbital period, but in individual binary orbits there can be significant deviations from the average light curves. There is a significant B-V variability with a standard deviation of 0.04 mag, and which may be related to the orbital phase. The binary appears to be bluest ~ 0.2 - 0.3 in orbital phase before optical minimum. Modeling of the light curves indicates an orbital inclination of ~ 20 - 50degr and a mass ratio M_1/M_2 < 3 (with M_1 the mass of the accreting star). The observed optical modulation is probably dominated by the changing aspect of the irradiated companion star, which has effective temperatures on the irradiated side ga 30 000 K. Our spectra show variable He iilambda 4686 emission, and broad Balmer absorption lines. The latter appear more prominent when the companion star is closest to us. Modeling the optical spectrum of the irradiated companion star by a composition of normal stellar spectra reproduces the observed colour and amplitude of the modulation, but predicts too strong Balmer absorption lines which must be significantly weaker because of strong irradiation. Based on observations collected at the European Southern Observatory, La Silla, Chile: ESO No 56.D-0589, 58.D-0275

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